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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Outstanding Options
A summary of outstanding options at December 31, 2016, 2015 and 2014, and changes during the years ended on those dates, is as follows:
 
Number
 of
Options
Weighted
Average Grant
Price Per Option
 
 
 
Outstanding December 31, 2013
1,101,014

$
8.35

 
 
 
Granted
—

—

Cancelled
(2,146
)
12.63

Exercised
(101,516
)
11.21

Outstanding December 31, 2014
997,352

$
8.05

 
 
 
Granted
—

—

Cancelled
(6,252
)
12.63

Exercised
(86,942
)
11.46

Outstanding December 31, 2015
904,158

$
7.70

 
 
 
Granted
—



Cancelled
(8,126
)
12.63

Exercised
(371,390
)
9.04

Outstanding December 31, 2016
524,642

$
6.67
Share Grant Activity
A summary of outstanding share grants at December 31, 2016, 2015, and 2014, and changes during the years ended on those dates, is as follows:
 
Shares
 
 
Outstanding December 31, 2013
426,180

 
 

Granted
181,530

Cancelled
(10,764
)
Vested and issued
(161,674
)
Outstanding December 31, 2014
435,272

 
 

Granted
190,258

Cancelled
(6,736
)
Vested and issued
(211,498
)
Outstanding December 31, 2015
407,296

 
 

Granted
172,520

Cancelled
(3,537
)
Vested and issued
(190,254
)
Outstanding December 31, 2016
386,025
Non Vested Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Options Valuation Assumptions
The following assumptions were utilized in the valuations:
 
2015
2016
Stock price (closing price on issue date)
$15.01
$21.70
Risk-free interest rate (interpolated rate between 2-year and 3-year U.S. treasury rates)
0.95%
0.89%
Dividend yield
1.57%
1.11%
Performance period
2.87 years
2.87 years